I'm running Sierra on a later 2009 Mac Mini with a 2.26 GHz Intel Core 2 Duo processor which must be fairly slow by now. I have limited needs of a computer and so, for the most part, it works fine for me. Mostly I'm using word processing but I am on the Internet a lot. But, despite having 8 GB of RAM, an SSD and 30 Mbps of broadband, many browser pages load very slowly. I'm wondering to what extent processor power affects Internet browsing and whether, with the increasing sophistication of web pages, my computer is beginning to struggle in this area. I have a limited budget but have been toying with upgrading to a refurbished 2012 Mac Mini with an i5 or i7 processor.